| ( | 45 | ( | 1 | + | 20 100 | ) | ) | + | ( | 5 100 | x | ) | = | x |
| Left side of the equation = | 45 | ( | 1 | + | 20 100 | ) | + | ( | 5 100 | x | ) |
| = | 45 | × | 1 | + | 45 | × | 20 100 | + | ( | 5 100 | x | ) |
| = | 45 | + | 9 | + | ( | 5 100 | x | ) |
| = | 54 | + | ( | 5 100 | x | ) |
| = | 54 | + | 5 100 | x |
| 54 | + | 5 100 | x | = | x |
5 100 | x | − | x | = | - | 54 |
| - | 19 20 | x | = | - | 54 |
| 54 | = | 19 20 | x |
19 20 | x | = | 54 |
| x | = | 54 | ÷ | 19 20 |
| = | 54 | × | 20 19 |
| x | = | 1080 19 |
| x | = | 56.842105 |